Accession Number:

AD0781718

Title:

Phase Separation in Ge-GeO2 Glasses.

Descriptive Note:

Technical rept.,

Corporate Author:

HARVARD UNIV CAMBRIDGE MASS DIV OF ENGINEERING AND APPLIED PHYSICS

Personal Author(s):

• Drummond,C. H. , III
• Turnbull,D.

Report Date:

1974-05-01

Pagination or Media Count:

21.0

Abstract:

The results reported here on a 7.5 mole percent excess Ge composition using differential scanning calorimetry have shown that a two-step phase separation mechanism is operative. A homogeneous Ge-GeO2 glass phase separates at 450C into amorphous GeO2 and amorphous GeO. The GeO phase separates at 570C into crystalline Ge and amorphous GeO2. Additional support for a two-step phase separation mechanism is provided by kinetic arguments based on the viscosity dependence on composition and on the structure of the amorphous GeO phase and its stability relative to the homogeneous Ge-GeO2 glass. Modified author abstract

Descriptors:

• *Germanium compounds
• *Germanium
• *Phase transformations
• Glass
• Microstructure
• Amorphous materials
• Chemical precipitation
• Differential thermal analysis

Subject Categories:

• Physical Chemistry

Distribution Statement:

APPROVED FOR PUBLIC RELEASE